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Sudoku Solution Path

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R1C1 is the only square in row 1 that can be <2>
R3C9 is the only square in row 3 that can be <8>
R4C5 is the only square in row 4 that can be <6>
R4C8 is the only square in row 4 that can be <2>
R4C6 is the only square in row 4 that can be <3>
R5C5 is the only square in row 5 that can be <2>
R7C3 is the only square in row 7 that can be <8>
R8C7 is the only square in row 8 that can be <2>
R7C5 is the only square in column 5 that can be <3>
R9C7 is the only square in column 7 that can be <5>
R9C3 is the only square in row 9 that can be <3>
R8C8 is the only square in row 8 that can be <3>
R8C2 is the only square in row 8 that can be <9>
R8C3 is the only square in row 8 that can be <5>
Squares R1C3 and R5C3 in column 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C3 - removing <1> from <167> leaving <67>
   R3C3 - removing <14> from <1467> leaving <67>
Squares R1C7 and R5C7 in column 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <49>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R3C7 - removing <4> from <3467> leaving <367>
   R7C7 - removing <49> from <469> leaving <6>
Squares R2C3 and R3C3 in block 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R2C2 - removing <7> from <1357> leaving <135>
   R3C1 - removing <7> from <147> leaving <14>
   R3C2 - removing <7> from <13457> leaving <1345>
R7C1 is the only square in column 1 that can be <7>
Squares R1C3 and R3C1 in block 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R2C2 - removing <1> from <135> leaving <35>
   R3C2 - removing <14> from <1345> leaving <35>
Squares R1C3 and R5C3 in column 3 and R1C7 and R5C7 in column 7 form a Simple X-Wing pattern on possibility <4>. All other instances of this possibility in rows 1 and 5 can be removed.
   R5C4 - removing <4> from <148> leaving <18>
   R5C6 - removing <4> from <1489> leaving <189>
   R1C9 - removing <4> from <149> leaving <19>
Intersection of column 9 with block 9. The value <4> only appears in one or more of squares R7C9, R8C9 and R9C9 of column 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R7C8 - removing <4> from <149> leaving <19>
Squares R1C3 and R9C9 form a remote locked pair. <14> can be removed from any square that is common to their groups.
   R1C9 - removing <1> from <19> leaving <9>
R1C7 can only be <4>
R1C3 can only be <1>
R5C7 can only be <9>
R6C8 can only be <4>
R5C3 can only be <4>
R3C1 can only be <4>
R9C1 can only be <1>
R4C2 can only be <7>
R9C9 can only be <4>
R7C2 can only be <4>
R7C9 can only be <1>
R4C4 can only be <4>
R6C2 can only be <1>
R8C4 can only be <1>
R6C5 can only be <5>
R6C6 can only be <9>
R6C4 can only be <7>
R3C5 can only be <1>
R7C8 can only be <9>
R8C6 can only be <4>
R5C4 can only be <8>
R3C8 can only be <6>
R2C6 can only be <8>
R3C3 can only be <7>
R2C8 can only be <1>
R5C6 can only be <1>
R2C4 can only be <5>
R2C2 can only be <3>
R3C7 can only be <3>
R2C3 can only be <6>
R3C2 can only be <5>
R2C7 can only be <7>


 

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